[pulseaudio-discuss] Realtek ALC892 on Fedora 21 Sound Connector constantly switching between output devices

[yaconsult]

    I have a fresh install of Fedora 21 with this chipset on an Asrock X58 Extreme6 motherboard. There is sound coming out of the speakers, but it is constantly cutting in and out. When I look in the audio and video settings under KDE, I can see the Device Configuration Connector constantly switching back and forth between Headphones and Line Out at a rate of several times per second.  I recorded this in a .gif file and you can view it here: http://makeagif.com/V3fT8p

The system is dual-boot and the audio hardware works fine under windows. The same thing happens in both gnome and kde.  The sound output I want to use is the analog stereo output on the motherboard which uses a Realtek ALC892.  I made an audio recording of what it sounds like when I push the audio test button in a .ogg file here: https://filetea.me/t1sW6lUC9ABSciAO5zTMvA1nQ
 
I have posted the alsa diagnostic info here: http://www.alsa-project.org/db/?f=7b2eecbdf8ddc95149059f01a330b86fbb7938dc

Is there a known workaround or solution for this problem? I believe I once had a similar or related problem on windows with this motherboard and found it documented in the realtek documentation. I think it was something about disabling notifications for audio devices being plugged and unplugged, but I'm not sure. Perhaps it's a jack detection issue, but what is the best solution for fedora 21? 

Another thing I tried was downloading the linux drivers from http://www.realtek.com.tw/downloads/ but they will not compile without errors on fedora 21.  I found some discussion about this driver here: http://forums.fedoraforum.org/showthread.php?t=299760 but I couldn't get it built on fedora 21.  It is not clear to me whether this driver would solve the problem or not or is even needed or not, if it could be built for fedora 21.  I tried contacting realtek but did not get a reply.
Thank you for any assistance!

 
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